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Thanks again everyone. As stated - I think the valve may be working as designed, but our water pressure is so bad I think I need to get that fixed first. We may get a pressure tank or I may have an issue with our home water filter... still running that down. Once we get that sorted out, I'll...

Thank you! We actually have pretty bad water pressure so this all makes sense. I'm pretty sure the valve has been working as designed. Mystery solved.

OK everyone - I think this attachment answers most of the questions you've asked, and I think it answers my question. The input (cold) water coming from the wall goes to both the hot water heater as well as the radiant floor heater. It also has a branch going to the wall right on the other...

The water heater drain pan has an outlet to the inside floor of the garage... I'll get back you to on your other questions in the next few days. Thanks!

Thanks everyone. I'll crawl back in there and check in the next few days. The pipes you are seeing (from my inside photos) are in fact on the other side of the wall from the 3 copper outside drains. More to come. Again - thanks for all the great thought on this.

I believe the TNPs on both the water heater and separate radiant floor heater feed their own external drains (the outside drains in the original post pictures). None of the drain lines are in the slab. I've added a few pictures to try and give you a better look. Thanks! - Eric

That's serious... I think I'll field a few more guesses before going there ;)

I agree but our AC is an outside, ground level swamp cooler on the other side of the house (and it's currently winterized). The hot water heater overflow drain is the one on the right. Could it be tied into main home plumbing for some reason? Thanks for the help!

I don't think so... I moved the washer when we moved in as there was a small leak under it - and there was only tile.

Thanks. We don't have forced air heat, just radian pipes in the floor. The furnace for those pipes has a overflow valve - which is the drain on the left (we tested it). Also - the problem started in the summer when the heat was off.

I have 3 copper overflow drains on the outside of my house. One is for the hot water heater overflow, one is for the radiant heat system overflow (in-floor heat) and the last one is... I have not idea - and it's leaking. We have an outside swamp cooler and a water softener and no other...